The report - the first of its kind in Wales - will be officially launched in Cardiff tonight.
Wales is blessed with some fantastic and unique wildlife, but it is declining, the pressures it faces are growing, and our responses are not ambitious enough. The next decade is a tipping point and we must act in order to make a difference; otherwise we will see the extinction of species at a local level not seen before in Wales.
– Dr Trevor Dines, Plantlife Cymru
We are challenging Welsh Government and Natural Resources Wales to put more of an emphasis on biodiversity, and to put energy and resources into helping wildlife, so that we can better understand the state of nature in Wales.
The State of Nature report found that recent environmental changes are having a 'dramatic impact' on the nature of the UK's land and seas. It also found evidence that species with specific habitat requirements are faring worse than those that can better adapt to a changing environment.
Other findings include:
Over one in seven plants in Wales are considered threatened
63% of Welsh butterflies are declining
More than a third of all woodland species assessed are in decline.
The number of breeding upland wading birds, such as curlew, lapwing and golden plover, have declined by more than 75% in recent decades
But the report also found that some species are on the increase, including hen harriers, black grouse and bats.
Wildlife in Wales is at crisis point, according to a report published today. The State of Nature report, which has been compiled by organisations including the RSPB and wildlife trusts, found that over one in 10 of all the species assess are under threat of extinction.
The report states that the decline of species is due to loss of habitat, changing in farming, development, climate change and the impact of non-native species.
We know from the many people who take part in Big Garden Birdwatch every year that garden birds are incredibly precious to us. But, several of our familiar and best-loved species are continuing to decline at alarming rates.
We go to great lengths to ensure that special habitats in Wales are given the right levels of designation and legal protection because of their role in supporting threatened wildlife, but what's very clear is that every one of our gardens, the spaces literally on our doorsteps, are really important too and help connect us all to nature on a daily basis.
Thousands of people across Wales have been taking part in the Big Garden Birdwatch over the last couple of days.
The RSPB says the cold weather has made birds head to parks and gardens in their search for food.
Amateur watchers noted the highest number of each species seen in their gardens or local park. Their findings will help experts gather vital information about the species that populate our gardens and parks.
Big Garden Birdwatch helps RSPB 'gather vital data'
The RSPB says this weekend's Big Garden Birdwatch, which is taking place across Wales, will help gather vital information about the species that populate our gardens and parks.
It's a great way to get to know the creatures that live around us, and that's especially important for children. Feeding garden birds can often be a child's first encounter with wildlife and can spark a lifelong interest in nature.
With more sub-zero temperatures on the way, many wild birds are likely to be driven into our parks and gardens in search of food.
This weekend thousands across Wales are expected to join in with the Big Garden Birdwatch - noting the highest number of each species seen in their gardens or local park, then submitting the results to the RSPB.
Last year almost 30,000 people across Wales took part in the watch, counting half a million birds between them.